Pressure switch



Spt. 29, 1936. J c ALBRECHT 2,656,084

PRESSURE SWITCH Filed July 18, 1955 2 Sheets-Sheet 1 Sept. 29, 1936- J.c. ALBRECHT I PRESSURE SWITCH Filed July 18, 1935 2 Sheets-Sheet 2 3mm J63 flZrw/if. Q W

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Patented Sept. 29, 1936 UNITED STATES PATE OFFICE 2,056,084 PRESSUREswrTcH Johan C. Albrecht, Gather, Okla. Application July 18, less,Serial No. 32,126

4 Claims.

This invention relates to a drag extension for the pressure valvemechanism which operates an automatic switch to start and stop a pumpfor the supply of water, gas, oil, air or the like.

The invention aims to provide a constant drag on the operating parts,magnetically and in a novel and eflicient manner, to prevent unduevibration of the switch operating mechanism, that is so hold theoperating mechanism to take up the variation in pressure of the water orfluid, especially in the stopping and starting of the motor, withoutunduly starting and stopping the motor, or failure to operate at all dueto the rapidity of the variations in pressure in the fluid.

The more specific objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawingsz- Figure 1 is a view illustrating the invention inconnection with a pump in perspective;

igure 2 is a perspective of the parts constituting the invention;

Figure 3 is a perspective View of the pressure valve; and

Figure 4 is a detail perspective view of the support for the switchoperating rod.

Referring specifically to the drawings, l0 designates a switch boxcontaining a switch adapted to be thrown into on and off positionsthrough the operation of a lever Ii movable on a vertical axis. Suchswitch controls a periodically operating electric motor M adapted topump water, gas, oil, air or other fluid, and the pressure of whichthrough a pipe l2 builds up in a chamber !3 to operate a plunger M,which is urged closed by an expansive spring 25, and the tension ofwhich is adjustable through the manipulation of a nut l6 threaded on theplunger, the plunger being slidably mounted in a casing or mounting I!to which the chamber or housing i3 is fastened as shown. The water orother fluid is adapted to be maintained in a tank T or the like in apredetermined quantity, and as such quantity diminishes to predeterminedextent, the pressure on the plunger i4 is relieved so that means is setinto motion to replenish the supply. Said plunger i l has two laterallyextending arms i8 fastened thereto each provided with a vertical sleeve19 at its outer end.

Removably disposed in one of the sleeves I9 is a crooked end 29 of aslidable Switch operating rod 2!. Such rod 2! is in sections 22 and 23,each of which has a sleeve 24 adjustably fastened thereon by a set screw25, and to each of which sleeves a Said section 23 is slidably supportedon a bracket 28 preferably of wood-.

secured for instance to the switch box In.

Another rod 39, for instance, of copper has a bent terminal 3i removablydisposed in the other sleeve is and at its other end is fastened to aniron bar 32 which is in contact with and slidable along a horseshoemagnet 33. One or more of these magnets may be provided and they arefastened in place to a supporting base 3 3 as by means of a clampingbolt structure 35. The iron bar 32 is adapted to be attracted by themagnetism from the magnet or magnets 33 and since the rod is of copper,the remaining parts are not subject to the magnetism to an extentsufficient to affect operation.

The casing ll is preferably bolted or otherwise 20 fastened as at 36 tothe support 34, which latter may be of wood, for instance, and fastenedto the water tank or the like adapted to be filled.

In the operation of the device, it will be clear that as the water orother fluid diminishes from the tank, the pressure in the chamber I3 sooperates the plunger I4 as to slide it, pulling the rod 2| and movingthe switch I I to the on position so that the pump operates to replenishthe supply of fluid to the predetermined extent, after which the rod 2|through the control of the plunger under pressure, moves in the oppositedirection cutting off the motor. During the sliding movement of theplunger, the coaction between the magnets 33 and iron bar 32 causes acontinuous drag on the operation of the plunger and thus will hold theplunger and prevent its undue operation under variations of thepressure, especially taking up the variation or surge of the water whichis greatest at the stand-pipe or overhead tank at the stop and startingpoints of the motor, and which undue and unnecessary operation at thepresent time overheats the switch and its wire connections, oftenburning the fuses, and often being so fast that the motor will neitherstart nor stop properly. The invention augments the action of the springI5 which is not suflicient to control or regulate the back suction ofthe water, which is greatest when stopping or starting the motor.

Various changes may be resorted to provided they fall within the spiritand scope of the invention.

What is claimed is:-

1. In combination with a plunger to operate 55 plunger, and a slidableswitch operating rod electrical mechanism adapted to pump a fluid andthrough the pressure of which the plunger is controlled, a slidable rodconnected to the plunger and magnetic means associated with the rod toexert a drag on the action of the plunger comprising an iron bar on therod, and a horseshoe magnet having both legs wiped by the bar.

2. In combination with a plunger to operate electrical mechanism adaptedto pump a fluid and through the pressure of which the plunger iscontrolled, a slidable rod connected to the plunger, magnetic meansassociated with the rod to exert a drag on the action of the plungercom-* prising an iron bar on the rod, and a magnet slidably wiped by thebar, said rod having ade-' pending terminal, an arm on the plungerengaged by said terminal, a second arm on'said connected to the secondarm.

3. In combination with a plunger to operate electrical mechanism adaptedto pump a fluid and through the pressure of which the plunger iscontrolled, a rod connected to the plunger, magnetic means associatedwith the rod to exert a drag on the action of the plunger comprising aniron bar on the rod, a magnet wiped by the bar,

said rod having a depending terminal, an arm on the plunger engaged bysaid terminal, a second arm on said plunger, a switch operating rodconnected to the second arm, a box for the switch, resilient connectionsin the last mentioned rod connected to the switch, and a support for therod on the box.

4. In combination with a plunger to operate electrical mechanism adaptedto pump a fluid and through the pressure of which the plunger iscontrolled, a rod connected to the plunger, magnetic means associatedwith the rod to exert a drag on the action of the plunger comprising aniron bar on the rod, a magnet wiped by the bar, said rod having adepending terminal, an arm on the plunger engaged by said terminal, asecond arm on said plunger, a switchcperating rod connected to thesecond arm, a box for the switch, resilient connections in the lastmentioned rod connected to the switch, a support for the rod on the box,a base supporting said magnet, a casing for the plunger on said base,

plunger carried by the casing.

JOHAN C. ALBRECHT.

